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            "title": "Design an Expression Tree With Evaluate Function",
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                    "name": "Math",
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                    "name": "Stack",
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                "Apply the concept of Polymorphism to get a good design",
                "Implement the Node class using NumericNode and OperatorNode classes.",
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                "OperatorNode Maintains the left and right nodes representing the left and right operands, and the evaluate function applies the operator to them."
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